package la.iok.aone.monitor.youtube.util;

import com.google.common.collect.Lists;
import la.iok.aone.monitor.youtube.util.excel.annotation.ExcelField;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;

public class ImportExcel {
    private Logger logger = LoggerFactory.getLogger(getClass());

    /**
     * 工作薄对象
     */
    private Workbook wb;

    /**
     * 工作表对象
     */
    private Sheet sheet;

    /**
     * 标题行号
     */
    private int headerNum;

    /**
     * 构造函数
     * @param fileName 导入文件，读取第一个工作表
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(String fileName, int headerNum)
            throws InvalidFormatException, IOException {
        this(new File(fileName), headerNum);
    }

    /**
     * 构造函数
     * @param fileName 导入文件对象，读取第一个工作表
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(File file, int headerNum)
            throws InvalidFormatException, IOException {
        this(file, headerNum, 0);
    }

    /**
     * 构造函数
     * @param fileName 导入文件
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @param sheetIndex 工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(String fileName, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        this(new File(fileName), headerNum, sheetIndex);
    }

    /**
     * 构造函数
     * @param fileName 导入文件对象
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @param sheetIndex 工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(File file, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        this(file.getName(), new FileInputStream(file), headerNum, sheetIndex);
    }

    /**
     * 构造函数
     * @param fileName 导入文件对象
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @param sheetIndex 工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(MultipartFile multipartFile, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        this(multipartFile.getOriginalFilename(), multipartFile.getInputStream(), headerNum, sheetIndex);
    }

    /**
     * 构造函数
     * @param fileName 导入文件对象
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @param sheetIndex 工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(String fileName, InputStream is, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        if (StringUtils.isBlank(fileName)){
            throw new RuntimeException("导入文档为空!");
        }else if(fileName.toLowerCase().endsWith("xls")){
            this.wb = new HSSFWorkbook(is);
        }else if(fileName.toLowerCase().endsWith("xlsx")){
            this.wb = new XSSFWorkbook(is);
        }else{
            throw new RuntimeException("文档格式不正确!");
        }
        if (this.wb.getNumberOfSheets()<sheetIndex){
            throw new RuntimeException("文档中没有工作表!");
        }
        this.sheet = this.wb.getSheetAt(sheetIndex);
        this.headerNum = headerNum;
        logger.debug("Initialize success.");
    }

    /**
     * 获取行对象
     * @param rownum
     * @return
     */
    public Row getRow(int rownum){
        return this.sheet.getRow(rownum);
    }

    /**
     * 获取数据行号
     * @return
     */
    public int getDataRowNum(){
        return headerNum+1;
    }

    /**
     * 获取最后一个数据行号
     * @return
     */
    public int getLastDataRowNum(){
        return this.sheet.getLastRowNum()+headerNum;
    }

    /**
     * 获取最后一个列号
     * @return
     */
    public int getLastCellNum(){
        return this.getRow(headerNum).getLastCellNum();
    }

    /**
     * 获取单元格值
     * @param row 获取的行
     * @param column 获取单元格列号
     * @return 单元格值
     */
    @SuppressWarnings("deprecation")
    public Object getCellValue(Row row, int column){
        Object val = "";
        try{
            Cell cell = row.getCell(column);
            if (cell != null){
                if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
                    val = cell.getNumericCellValue();
                }else if (cell.getCellType() == Cell.CELL_TYPE_STRING){
                    val = cell.getStringCellValue();
                }else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA){
                    val = cell.getCellFormula();
                }else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN){
                    val = cell.getBooleanCellValue();
                }else if (cell.getCellType() == Cell.CELL_TYPE_ERROR){
                    val = cell.getErrorCellValue();
                }
            }
        }catch (Exception e) {
            return val;
        }
        return val;
    }

    /**
     * 获取导入数据列表
     * @param cls 导入对象类型
     * @param groups 导入分组
     */
    public <E> List<E> getDataList(Class<E> cls, int... groups) throws InstantiationException, IllegalAccessException{
        List<Object[]> annotationList = Lists.newArrayList();
        // Get annotation field
        Field[] fs = cls.getDeclaredFields();
        for (Field f : fs){
            ExcelField ef = f.getAnnotation(ExcelField.class);
            if (ef != null && (ef.type()==0 || ef.type()==2)){
                if (groups!=null && groups.length>0){
                    boolean inGroup = false;
                    for (int g : groups){
                        if (inGroup){
                            break;
                        }
                        for (int efg : ef.groups()){
                            if (g == efg){
                                inGroup = true;
                                annotationList.add(new Object[]{ef, f});
                                break;
                            }
                        }
                    }
                }else{
                    annotationList.add(new Object[]{ef, f});
                }
            }
        }
        // Get annotation method
        Method[] ms = cls.getDeclaredMethods();
        for (Method m : ms){
            ExcelField ef = m.getAnnotation(ExcelField.class);
            if (ef != null && (ef.type()==0 || ef.type()==2)){
                if (groups!=null && groups.length>0){
                    boolean inGroup = false;
                    for (int g : groups){
                        if (inGroup){
                            break;
                        }
                        for (int efg : ef.groups()){
                            if (g == efg){
                                inGroup = true;
                                annotationList.add(new Object[]{ef, m});
                                break;
                            }
                        }
                    }
                }else{
                    annotationList.add(new Object[]{ef, m});
                }
            }
        }
        // Field sorting
        Collections.sort(annotationList, new Comparator<Object[]>() {
            public int compare(Object[] o1, Object[] o2) {
                return new Integer(((ExcelField)o1[0]).sort()).compareTo(
                        new Integer(((ExcelField)o2[0]).sort()));
            };
        });
        //log.debug("Import column count:"+annotationList.size());
        // Get excel data
        List<E> dataList = Lists.newArrayList();
        for (int sheetAt = 0; sheetAt < this.wb.getNumberOfSheets(); sheetAt++) {
            this.sheet = this.wb.getSheetAt(sheetAt);
            // 获取需要解析列的索引
            Map<Object[], Integer> titleIndex = new HashMap<Object[], Integer>();
            Row headerRow = this.getRow(0);
            for (Object[] titleObjects : annotationList) {
                for (Cell cell : headerRow) {
                    ExcelField titleExcelField = (ExcelField) titleObjects[0];
                    if (titleExcelField.title().equals(cell.getStringCellValue())) {
                        titleIndex.put(titleObjects, cell.getColumnIndex());
                    }
                }
            }
            for (int i = this.getDataRowNum(); i <= this.getLastDataRowNum(); i++) {
                E e = (E)cls.newInstance();
                int column = 0;
                Row row = this.getRow(i);
                StringBuilder sb = new StringBuilder();
                for (Map.Entry<Object[], Integer> entry : titleIndex.entrySet()){
                    Object val = this.getCellValue(row, entry.getValue());
                    if (val != null){
                        ExcelField ef = (ExcelField)entry.getKey()[0];
                        // If is dict type, get dict value
                        if (StringUtils.isNotBlank(ef.dictType())){
//                            val = DictUtils.getDictValue(val.toString(), ef.dictType(), "");
                            logger.debug("Dictionary type value: ["+i+","+ef.dictType()+"] " + val);
                        }
                        // Get param type and type cast
                        Class<?> valType = Class.class;
                        if (entry.getKey()[1] instanceof Field){
                            valType = ((Field)entry.getKey()[1]).getType();
                        }else if (entry.getKey()[1] instanceof Method){
                            Method method = ((Method)entry.getKey()[1]);
                            if ("get".equals(method.getName().substring(0, 3))){
                                valType = method.getReturnType();
                            }else if("set".equals(method.getName().substring(0, 3))){
                                valType = ((Method)entry.getKey()[1]).getParameterTypes()[0];
                            }
                        }
                        //log.debug("Import value type: ["+i+","+column+"] " + valType);
                        try {
                            if (valType == String.class){
                                String s = String.valueOf(val.toString()).trim();
                                if(StringUtils.endsWith(s, ".0")){
                                    val = StringUtils.substringBefore(s, ".0");
                                }else{
                                    val = String.valueOf(val.toString()).trim();
                                }
                            }else if (valType == Integer.class){
                                val = Double.valueOf(val.toString()).intValue();
                            }else if (valType == Long.class){
                                val = Double.valueOf(val.toString()).longValue();
                            }else if (valType == Double.class){
                                val = Double.valueOf(val.toString());
                            }else if (valType == Float.class){
                                val = Float.valueOf(val.toString());
                            }else if (valType == Date.class){
                                val = DateUtil.getJavaDate((Double)val);
                            }else{
                                if (ef.fieldType() != Class.class){
                                    val = ef.fieldType().getMethod("getValue", String.class).invoke(null, val.toString());
                                }else{
                                    val = Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(),
                                            "fieldtype."+valType.getSimpleName()+"Type")).getMethod("getValue", String.class).invoke(null, val.toString());
                                }
                            }
                        } catch (Exception ex) {
                            logger.info("Get cell value ["+i+","+column+"] error: " + ex.toString());
                            val = null;
                        }
                        // set entity value
                        if (entry.getKey()[1] instanceof Field){
                            Reflections.invokeSetter(e, ((Field)entry.getKey()[1]).getName(), val);
                        }else if (entry.getKey()[1] instanceof Method){
                            String mthodName = ((Method)entry.getKey()[1]).getName();
                            if ("get".equals(mthodName.substring(0, 3))){
                                mthodName = "set"+StringUtils.substringAfter(mthodName, "get");
                            }
                            Reflections.invokeMethod(e, mthodName, new Class[] {valType}, new Object[] {val});
                        }
                    }
                    sb.append(val+", ");
                }
                dataList.add(e);
                logger.debug("Read success: [{}] {}", i, e);
            }
        }
        return dataList;
    }
}